带RYC型串联间隙结构的金属氧化物避雷器及其间隙并联高压电阻器

介绍了一种由碟形放电电极、线性高压电阻和照射电极组成的独特的 RYC型串联间隙结构。评述了带 RYC型串联间隙金属氧化物避雷器在承受工频短时过电压等多方面的优点。着重介绍了 RYC型串联间隙关键元件高压无感玻璃釉线性电阻器的设计、制造和电性能。给出了 RYC型串联间隙并联电阻器在金属氧化物避雷器中的应用情况。

10kV金属氧化物避雷器的应用

结合 1 0 k V金属氧化物避雷器在电网中的作用和要求 ,介绍了 1 0 k V电网中各种常见的过电压 ,并对 1 0 k V金属氧化物避雷器选用无间隙结构还是带串联间隙结构、选用三星型接线还是四星型接线等问题提出了自己的看法。

Numerical Investigation & Comparison of a Tandem-Bladed Turbocharger Centrifugal Compressor Stage with Conventional Design

Extensive numerical investigations of the performance and flow structure in an unshrouded tandem-bladed centrifugal compressor are presented in comparison to a conventional compressor.Stage characteristics are explored for various tip clearance levels,axial spacings and circumferential clockings.Conventional impeller was modified to tandem-bladed design with no modifications in backsweep angle,meridional gas passage and camber distributions in order to have a true comparison with conventional design.Performance degradation is observed for both the conventional and tandem designs with increase in tip clearance.Linear-equation models for correlating stage characteristics with tip clearance are proposed.Comparing two designs,it is clearly evident that the conventional design shows better performance at moderate flow rates.However;near choke flow,tandem design gives better results primarily because of the increase in throat area.Surge point flow rate also seems to drop for tandem compressor resulting in increased range of operation.